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boringssl/crypto/bn/rsaz_exp.c
David Benjamin 593b6a44fe Remove RSAZ-512. 
This gives a 15-16% perf boost for 1024-bit RSA keys, but 1024-bit RSA
keys are no longer important enough for this code to carry its weight.

Change-Id: Ia9f0e7fec512c28e90754ababade394c1f11984d
Reviewed-on: https://boringssl-review.googlesource.com/12841
Commit-Queue: David Benjamin <davidben@google.com>
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
2016-12-14 22:12:50 +00:00

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/*****************************************************************************
* *
* Copyright (c) 2012, Intel Corporation *
* *
* All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions are *
* met: *
* *
* * Redistributions of source code must retain the above copyright *
* notice, this list of conditions and the following disclaimer. *
* *
* * Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the *
* distribution. *
* *
* * Neither the name of the Intel Corporation nor the names of its *
* contributors may be used to endorse or promote products derived from *
* this software without specific prior written permission. *
* *
* *
* THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION ""AS IS"" AND ANY *
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE *
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR *
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTEL CORPORATION OR *
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, *
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR *
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING *
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS *
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
* *
******************************************************************************
* Developers and authors: *
* Shay Gueron (1, 2), and Vlad Krasnov (1) *
* (1) Intel Corporation, Israel Development Center, Haifa, Israel *
* (2) University of Haifa, Israel *
*****************************************************************************/
#include <openssl/base.h>
#if !defined(OPENSSL_NO_ASM) && defined(OPENSSL_X86_64)
#include "rsaz_exp.h"
#include <openssl/mem.h>
#include "../internal.h"
/*
* See crypto/bn/asm/rsaz-avx2.pl for further details.
*/
void rsaz_1024_norm2red_avx2(void *red,const void *norm);
void rsaz_1024_mul_avx2(void *ret,const void *a,const void *b,const void *n,BN_ULONG k);
void rsaz_1024_sqr_avx2(void *ret,const void *a,const void *n,BN_ULONG k,int cnt);
void rsaz_1024_scatter5_avx2(void *tbl,const void *val,int i);
void rsaz_1024_gather5_avx2(void *val,const void *tbl,int i);
void rsaz_1024_red2norm_avx2(void *norm,const void *red);
alignas(64) static const BN_ULONG one[40] =
{1,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
alignas(64) static const BN_ULONG two80[40] =
{0,0,1<<22,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
void RSAZ_1024_mod_exp_avx2(BN_ULONG result_norm[16],
const BN_ULONG base_norm[16], const BN_ULONG exponent[16],
const BN_ULONG m_norm[16], const BN_ULONG RR[16], BN_ULONG k0)
{
alignas(64) uint8_t storage[(320 * 3) + (32 * 9 * 16)]; /* 5.5KB */
unsigned char *a_inv, *m, *result,
*table_s = storage + (320 * 3),
*R2 = table_s; /* borrow */
int index;
int wvalue;
if (((((uintptr_t)storage & 4095) + 320) >> 12) != 0) {
result = storage;
a_inv = storage + 320;
m = storage + (320 * 2); /* should not cross page */
} else {
m = storage; /* should not cross page */
result = storage + 320;
a_inv = storage + (320 * 2);
}
rsaz_1024_norm2red_avx2(m, m_norm);
rsaz_1024_norm2red_avx2(a_inv, base_norm);
rsaz_1024_norm2red_avx2(R2, RR);
rsaz_1024_mul_avx2(R2, R2, R2, m, k0);
rsaz_1024_mul_avx2(R2, R2, two80, m, k0);
/* table[0] = 1 */
rsaz_1024_mul_avx2(result, R2, one, m, k0);
/* table[1] = a_inv^1 */
rsaz_1024_mul_avx2(a_inv, a_inv, R2, m, k0);
rsaz_1024_scatter5_avx2(table_s,result,0);
rsaz_1024_scatter5_avx2(table_s,a_inv,1);
/* table[2] = a_inv^2 */
rsaz_1024_sqr_avx2(result, a_inv, m, k0, 1);
rsaz_1024_scatter5_avx2(table_s,result,2);
#if 0
/* this is almost 2x smaller and less than 1% slower */
for (index=3; index<32; index++) {
rsaz_1024_mul_avx2(result, result, a_inv, m, k0);
rsaz_1024_scatter5_avx2(table_s,result,index);
}
#else
/* table[4] = a_inv^4 */
rsaz_1024_sqr_avx2(result, result, m, k0, 1);
rsaz_1024_scatter5_avx2(table_s,result,4);
/* table[8] = a_inv^8 */
rsaz_1024_sqr_avx2(result, result, m, k0, 1);
rsaz_1024_scatter5_avx2(table_s,result,8);
/* table[16] = a_inv^16 */
rsaz_1024_sqr_avx2(result, result, m, k0, 1);
rsaz_1024_scatter5_avx2(table_s,result,16);
/* table[17] = a_inv^17 */
rsaz_1024_mul_avx2(result, result, a_inv, m, k0);
rsaz_1024_scatter5_avx2(table_s,result,17);
/* table[3] */
rsaz_1024_gather5_avx2(result,table_s,2);
rsaz_1024_mul_avx2(result,result,a_inv,m,k0);
rsaz_1024_scatter5_avx2(table_s,result,3);
/* table[6] */
rsaz_1024_sqr_avx2(result, result, m, k0, 1);
rsaz_1024_scatter5_avx2(table_s,result,6);
/* table[12] */
rsaz_1024_sqr_avx2(result, result, m, k0, 1);
rsaz_1024_scatter5_avx2(table_s,result,12);
/* table[24] */
rsaz_1024_sqr_avx2(result, result, m, k0, 1);
rsaz_1024_scatter5_avx2(table_s,result,24);
/* table[25] */
rsaz_1024_mul_avx2(result, result, a_inv, m, k0);
rsaz_1024_scatter5_avx2(table_s,result,25);
/* table[5] */
rsaz_1024_gather5_avx2(result,table_s,4);
rsaz_1024_mul_avx2(result,result,a_inv,m,k0);
rsaz_1024_scatter5_avx2(table_s,result,5);
/* table[10] */
rsaz_1024_sqr_avx2(result, result, m, k0, 1);
rsaz_1024_scatter5_avx2(table_s,result,10);
/* table[20] */
rsaz_1024_sqr_avx2(result, result, m, k0, 1);
rsaz_1024_scatter5_avx2(table_s,result,20);
/* table[21] */
rsaz_1024_mul_avx2(result, result, a_inv, m, k0);
rsaz_1024_scatter5_avx2(table_s,result,21);
/* table[7] */
rsaz_1024_gather5_avx2(result,table_s,6);
rsaz_1024_mul_avx2(result,result,a_inv,m,k0);
rsaz_1024_scatter5_avx2(table_s,result,7);
/* table[14] */
rsaz_1024_sqr_avx2(result, result, m, k0, 1);
rsaz_1024_scatter5_avx2(table_s,result,14);
/* table[28] */
rsaz_1024_sqr_avx2(result, result, m, k0, 1);
rsaz_1024_scatter5_avx2(table_s,result,28);
/* table[29] */
rsaz_1024_mul_avx2(result, result, a_inv, m, k0);
rsaz_1024_scatter5_avx2(table_s,result,29);
/* table[9] */
rsaz_1024_gather5_avx2(result,table_s,8);
rsaz_1024_mul_avx2(result,result,a_inv,m,k0);
rsaz_1024_scatter5_avx2(table_s,result,9);
/* table[18] */
rsaz_1024_sqr_avx2(result, result, m, k0, 1);
rsaz_1024_scatter5_avx2(table_s,result,18);
/* table[19] */
rsaz_1024_mul_avx2(result, result, a_inv, m, k0);
rsaz_1024_scatter5_avx2(table_s,result,19);
/* table[11] */
rsaz_1024_gather5_avx2(result,table_s,10);
rsaz_1024_mul_avx2(result,result,a_inv,m,k0);
rsaz_1024_scatter5_avx2(table_s,result,11);
/* table[22] */
rsaz_1024_sqr_avx2(result, result, m, k0, 1);
rsaz_1024_scatter5_avx2(table_s,result,22);
/* table[23] */
rsaz_1024_mul_avx2(result, result, a_inv, m, k0);
rsaz_1024_scatter5_avx2(table_s,result,23);
/* table[13] */
rsaz_1024_gather5_avx2(result,table_s,12);
rsaz_1024_mul_avx2(result,result,a_inv,m,k0);
rsaz_1024_scatter5_avx2(table_s,result,13);
/* table[26] */
rsaz_1024_sqr_avx2(result, result, m, k0, 1);
rsaz_1024_scatter5_avx2(table_s,result,26);
/* table[27] */
rsaz_1024_mul_avx2(result, result, a_inv, m, k0);
rsaz_1024_scatter5_avx2(table_s,result,27);
/* table[15] */
rsaz_1024_gather5_avx2(result,table_s,14);
rsaz_1024_mul_avx2(result,result,a_inv,m,k0);
rsaz_1024_scatter5_avx2(table_s,result,15);
/* table[30] */
rsaz_1024_sqr_avx2(result, result, m, k0, 1);
rsaz_1024_scatter5_avx2(table_s,result,30);
/* table[31] */
rsaz_1024_mul_avx2(result, result, a_inv, m, k0);
rsaz_1024_scatter5_avx2(table_s,result,31);
#endif
const uint8_t *p_str = (const uint8_t *)exponent;
/* load first window */
wvalue = p_str[127] >> 3;
rsaz_1024_gather5_avx2(result,table_s,wvalue);
index = 1014;
while(index > -1) { /* loop for the remaining 127 windows */
rsaz_1024_sqr_avx2(result, result, m, k0, 5);
wvalue = *((const unsigned short*)&p_str[index / 8]);
wvalue = (wvalue>> (index%8)) & 31;
index-=5;
rsaz_1024_gather5_avx2(a_inv,table_s,wvalue); /* borrow a_inv */
rsaz_1024_mul_avx2(result, result, a_inv, m, k0);
}
/* square four times */
rsaz_1024_sqr_avx2(result, result, m, k0, 4);
wvalue = p_str[0] & 15;
rsaz_1024_gather5_avx2(a_inv,table_s,wvalue); /* borrow a_inv */
rsaz_1024_mul_avx2(result, result, a_inv, m, k0);
/* from Montgomery */
rsaz_1024_mul_avx2(result, result, one, m, k0);
rsaz_1024_red2norm_avx2(result_norm, result);
OPENSSL_cleanse(storage,sizeof(storage));
}
#endif /* OPENSSL_X86_64 */
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